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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4abe90220f1006979d055bec703f48d24c9cc4709bc896de01eaa6f53713775' 
  AND token = 'klFkBFWmVdpka1VFW/z9CL5IHefPA5XYj05I20u7SHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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