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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435ea94b9bbe7a34b3d5865143c0a610149615f8ec759062c5a64870c753d13f' 
  AND token = 'T7TNPl3X5R5fCuVyQp7FWbTcaL5tLfC4w9ZGHEfs+w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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