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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229abca9d3c9888a48d034a47123f39a3d96a8f441ab79d1a599b806f999842a' 
  AND token = 'iudaU7kngX5k9lsdpcE2tMwZySnKWg6+g9zURvECc64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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