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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd361b569a640d4a3cf9cf223910d6edf23d5f19eba77238db8e57f9dfe28400' 
  AND token = 'j+y5tAYFhw4VLvqh240Pvqmb4ey9S5TAaGSu4IwebNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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