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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3059c0a3a380f0ecb8349a25aa392b792497b661afd10df6f7f05f3af8a570d' 
  AND token = 'oHbtkCO+zrfcEr6McEXLn49rK/QmDjkpV+wRKVw1Sb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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