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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd03ed50325748a57e54e7f4ddd80cf3baa6ab232c2e2ed93bb16143c084e22' 
  AND token = 'El54/aO1aBqhAutOZVxBAl6MPxATYoaEQ7ppn7T629U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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