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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0ea47a2eae1af424077cdd5ce99f9db099859370405d3c3ee239a4a1be92db' 
  AND token = 'q1H+HU8BBGNYPJ+bPh1/JfrUOTnH7+3KwKaxONR/f1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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