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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce74415805d57912399a066f3417ba5324318d1dab3c63f536bd4e2dd623185d' 
  AND token = 'LLXNNJl/OydtxwBS1g3UM8UW9ehjA2cVnD1ZtrOf8OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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