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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035e6658dd5fc44f4a096aacd3dda91c03ca5e82cfd5a3be77cc8ecbb98f235e' 
  AND token = 'StuRiB/2mtZNvI3fHHDvMNaYyJQgDPXMMIC7y6Gvb94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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