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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c257976bddd2fe3bafd9a866cb409379ed3aebee70a278a32a348f72c175d1' 
  AND token = 'F9VL2cfGIEtTR7ty6lWig7KO2oSh6xxzhVwekx6OpUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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