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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf23b6feef80ddc29ea5381a1a50ab0938120c25bf78763658256bfd7d9c38f' 
  AND token = 'pL+vSiJ7sidmxSpl8PdsHCsuTY0KrsX7XpAEaP3NJ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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