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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215fa8d0ee7f9f94ca6bd7c783a7069943fba36d16eead23a79153f3a0874a18' 
  AND token = 'N6mUBVOEpUCavNugwy0OxAo6BTM6q0DTUpCUKM/Iu4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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