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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec49cdac34605af00def4f84ce93ee0ed587d14d60639034ebb747ef9733dc98' 
  AND token = 'vnIb2CrjFtpXQhPo7NgAwL+Ljm/yHiFWnMq4+K+cyeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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