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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd916a820eb509f1d15655b754ec3a4d0ece1d03774fedf4ab11e37ce81f560bf' 
  AND token = 'mwwD907CExBa5gpBWU2x74FezwFA65wWVOK76Z+7Y+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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