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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a11945702e1d6d5c738382f0b49940bef1bec63e487364ea79f258db1b3dea' 
  AND token = 'QU4Oryh6m4IA6n1mHOe90oOT+Tyz7zSQzNBPlXmV0DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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