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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8229ae1ff765b22a64281ce1882f9fb2ca6fe4d6285767bba42412d289b4058' 
  AND token = '7u3RRITzz7RPelcuXX0NW4U88389WWKB6lyw8xf+4pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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