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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d0c8f952b30cc046095ddb75b35280e8dae6cbc59a3ca5ff001a695ff1659e' 
  AND token = '1GZmT52Td7eqYcn5P3UXvR2rQ1vuwniTst+LgmlbL/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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