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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc62a40f2a81bbac327682e913e4e03ae33c22718ee7c56aaa09f7ca91fedf7d' 
  AND token = 'SyIdotQtImEeSceLm3YuZAMpGGjEYXYQOEUX77d1ELo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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