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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5c6ee0aa0ce3b1ca76852d11717f593af08a0521e05da23da488987098c63c' 
  AND token = '0fhTq+DI8l+HUYH8k0aiLAAcy3d0el2zefBp1HAzwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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