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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bc2603727ae8705920d839bd7e207f6b61ac749bcc957e722e0477de955a85' 
  AND token = 'eGXes1+JILhghWFz4N+WGy3sdoF0I/uAfxRlCpuij6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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