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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d67c7b171604fb60016c651f5872729e317ec536803de5c3858d2565d41b12c' 
  AND token = 'USv2jWiVfEZTvshmh02kyG+9MRdAOy4DoqeTR+2g+s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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