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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1428b62c8a792fb18fc79b790022e082ac90c5f32e20f3154a12f98135ba7097' 
  AND token = 'i27SJjkNTmM+IysYKkcLxwH2ysGL51TjSeiw6i3htRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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