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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8df74f83788f6a8e00acf73288d2287e661fdc0cb7e0b5d838df5809a7c31c' 
  AND token = 'Nh+w4VgsqoMAck0k1ytOe/nVVu1539u6Y5aJTxMRFRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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