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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5160f7ce80066b5a10622395097942c1a5b12438e675f8412624246ab4bc5360' 
  AND token = 'G4CTSmDcZhUxPHnlC4XH/Q5A5qhBeROYCopP9qWkmAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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