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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f6b5bba98d30324e5d7b978ed22586ce5d44f6bca08414051775dcf90c7cf6' 
  AND token = 'ThNRCy//V62hbrb9shv2W5MJHg+uVFvitMktgKRoX7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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