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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dc91a5d88ba00494c9fc174e20e11a4a55550bc13cbe4c0a19f327ae6c4021' 
  AND token = 'rNS6GMe71hU7iX34EDjEjJPxZFF0E1T9myYA3ZeO7do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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