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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc14bb534c7c029688b7261acf9aac29e7d96e8239d92841fce945950f4f8d58' 
  AND token = 'T0OFp7wo8/onlIiNw598WmoOm5p9/ntHi+bP4blYTCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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