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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaa30ec6de6805116dbd115901ee0685d13a169e2157e4de87779196df8554b' 
  AND token = '7E6njldxh5C1c1f8fOJKu5AXFcJQ+53fJX+blE4jpN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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