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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61241666159107646fabb972535e0ab0ad0ab3565c4dd873c3df475a41596d0' 
  AND token = 'tZuPcHJsdwhiZCfNnHH8bIgSqTnEZ3CXiq3Tffm03bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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