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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db9febc3a5a6521341466d983ea363ac69971e2042d1cc8b6d41793f9378b8a' 
  AND token = 'vFimR4onVb7PcF1gQle+5ovUF2Q1RvA0zeIs2iG2cRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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