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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a347e5fa7af4a96209287b576698d76fdb3569c1b00e1d144e98e9a86a31fd' 
  AND token = 'OAy0t3/680H9beMl+S4OHpK4kE97dx43hn1/KPIbstE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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