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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961fb022eae26f419cc0df9742e90fe1ae9903faa8099885e5b7446f92ba3b65' 
  AND token = 'HV5I2kPjsCDFOukE1EeF1cyjQWcKu9Op3B7XZUqKBeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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