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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd821ffe07ae474a4c489efd6e804176e551ae88d2f99e5ff843c7e099375513' 
  AND token = 'NDijhUK/EMi3xR5Ny0+eSAEzdgfu0Se+zI8nNcdk/V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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