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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9814e1c40dd6ff9386d283ec49454ae913fdbd753ad069cd5b00f4736bf0aefb' 
  AND token = '8464rNYBC+Z8D7QTl/FC4ZZE0J3uDjV4cVRWhqc41EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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