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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db75583a455529990c842cc0834b2cff417c080cf33d113753577b6f5be3e3fa' 
  AND token = '39CbM3jZgVrRb2XccsynhC93qXdxahrz1E1/hTC1a1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}