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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa95b034e247520b18001e7beadcd4c91511c344cf60a0b7194f72d4d27544fc' 
  AND token = '+zDBLpvVu7OtJiS2lLuJt8Nmzsf133biiItGyZRHxR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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