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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df38a77642ed89a867fca8c320fc63479602aa3292a4381e79e4da2bc2e4d3f' 
  AND token = 'Y4QGb7CoOYZdB3vx570UqEsqMJn4BvLF9RjpGjYgHaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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