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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f9702c5b66771eea6e8d8bbd56c0b632eeced35e02ad364c64840d728d1f3c' 
  AND token = '0k4x62p2Yi3irvLcctMnieT872nKtY5n4Ium7keVuhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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