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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37201d6c74460b013a871b7dd0129668b9f23d00bfb0bf2f64bc6d47dfac4c3a' 
  AND token = 'SV8ZxIzdR2bnxnOsq1k7iSgS/yZrGqPwuIq6xo2/Lhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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