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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6d0a3d3ccc38aa7e9937ef9871f1090ff8aaafef64b40317c6c7d2564bfeca' 
  AND token = 'Wd3378tNQ4N0AoxjfAe0Iy4ghvrFCTRA2bqQsEZ5N/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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