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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03101a8c50732c02e758218bea123f67b8ff2ee013cc984ccdde40555ffd4a30' 
  AND token = 'ueaoY7KLK+E0Ux9/3v4SW6WvhLJFrn+k8opvgxChbc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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