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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7f2e1bf6db02b12c979316165f1bc10eff0a10b0e3e29adcb767200be8ed14' 
  AND token = 'O98qtivh6O5UWB8KIb54EzAnJ9NnN/o3eMhS307RlxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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