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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbc4ce1f9e16e9dbeaf5cc6ca2616244d0f6f330ccaf59accedc559ecb59d69' 
  AND token = 'dfuEQVQ0e7vDPXQ2uHOmdhvjuYu6J61TtTjC30npN90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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