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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7197516d752d6331f32c8bb4a8c6cc31396845f811b14992fadfe2cf4c11651e' 
  AND token = 'f0oNgyKWfy3f7fXR1UAzky/roOXZkpNA1KZXcHfYzvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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