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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960f9943316d19b31060de066767a0ca8e384f4b9bde769739fd67d173192ba0' 
  AND token = 'g99+EzlGzi72i8RQKFXZXdrPLNjZRHhnjE8cJht/4R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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