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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd8a74e214fec2b870758f64dad1e533dd4cf1f8502340d3361ff658f97c4bd' 
  AND token = '9Ut/xYeCX+LuYj0T95Ha2iFingtAO7Sk0odhPf0U/Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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