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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc6641ef6200b21b6c4bac348325086ce7736e0c20a8d49a770bb9a2276fd81' 
  AND token = '0TrZASGp7teHGFfQsj0rFAnf9VmX31NHQ31l3OIKnNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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