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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce0373377eaabed41718b1192e63357db0d2f6296ca2832a9fe6cc316f64919' 
  AND token = 'xlK7ezOt2g8j4kn1i0iX88dg5ZhjYhE1a9pV3BgZWqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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