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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522e2778b73600ad9fed5c1731849b3b409d6fa780833902f85da0ca2324c3e4' 
  AND token = 'bTHPI66DkV4EA4b2oqXtcsZP3mq9TObjsU33uLTv/jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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