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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7582dfc0928ba6f4d1d42f8f357942fbc9d9d6dd60aeaadcb24c9ce77783a991' 
  AND token = '6Hl0f2EMK6cBLlLK4zMYwVpG0m8v40A37TkYT/Lfohw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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