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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101b79d8deb3b79eb7e29139a3f3638c31aeced1407b4ad9a2c439a424420d9a' 
  AND token = 'ljTzlrrWoWOYlVYORgmtqZPKQMO+zgC4tWeE3ld+Xac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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