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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b446a93fe64b73f074762f63e6368a07c11aac6676cadd669a9b1224c87342' 
  AND token = 'Fr2wb7O0e3mJMyVLYRfHMmjCWO4l0I5d3ub6WgOM9ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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