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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f31cdf3b3251467c1f828d09cf2adcc108786b812036f37d4705258da95e813' 
  AND token = 'qWBFtHmbZXmM69W4vU2GzejMyNXZ3uZuRqaVWc26Q6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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