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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9159ab226f425f05fbaa0418077bab2ce98de27bfe6871f752e2deca152c59' 
  AND token = 'd7Gqhq2dDxNPIVf3ip/uZrAR2fXbfGiha3Sr6+l/P8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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