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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f22934b94550f44636571c52fe88a1b0d04ad0dd7e2a558104f15daf92dd44' 
  AND token = 'ZPFJKdU+CGp0v44nlG9YbSNPopVUNhHrzWN0DMdJXR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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