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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6798bd1c664cf6ebcb4ecee4aa2548343a7f59aba54ce04d780683fe5075ac' 
  AND token = 'ZnU8R8/wl0KfMkCXAZH0gAFR3Xqlquptmz+VJcZPseo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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