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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce98905965351fb4bac62df54609d6486f4ba8859633ca7bd87a73ee80fb9e59' 
  AND token = 'SCF5aK21Ka7+q2nFUmm55ULFl1ueAQ/uXD4q/2SEwss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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