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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afe7c775d224a6e65f06a38daaa5a3c5af8542256d5bbd261013c6c33640cf5' 
  AND token = 'mXcmXfPx3NbJRxSb6XzRkaq1IQb43eeb0xaVvArd1Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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